During middle school, Hiro Kunimi (pitcher), Hideo Tachibana (third baseman), and Atsushi Noda (catcher) were teammates on the baseball team. Thanks to their exploits, their school achieved an unbeaten record on their way to consecutive national championships.
However, after an injury, a doctor told Hiro that if he continued pitching, his elbow would shatter in three months. Likewise, Noda was diagnosed with a career-ending waist injury by the same doctor, ending their dreams of Kōshien. They chose to go to Senkawa High School, which lacked a baseball team. On the other hand, Hideo went to Meiwa Daiichi High School, one of the top-ranked high schools in the country, along with Hikari Amamiya, his girlfriend (and Hiro's childhood friend).
Hiro decided to join the soccer team, and Noda joined the swim team. After it was revealed that the doctor who "diagnosed" Hiro (and Noda) was a quack, Hiro and Noda return to playing baseball. Their first hurdle was to persuade their headmaster, who hated baseball. Haruka Koga, the manager of the baseball fans club, assisted them in their endeavors.